Tracking control apparatus using digitized vertical synchronizin

Details Tracking control apparatus using digitized vertical synchronizin Tracking control apparatus using digitized vertical synchronizin

1984-12-27

1986-12-30

Cardillo, Raymond F.

Dynamic magnetic information storage or retrieval

Monitoring or testing the progress of recording

360 77, 360 78, 358342, H04N 5781, G11B 556, G11B 2110

Patent

active

046333347

ABSTRACT:
A tracking control apparatus for a disc reproducing apparatus comprises a circuit including a head for reproducing an FM video signal from a disc recorded with the FM video signal on concentric tracks or a spiral track formed on a recording surface thereof, a moving mechanism including a motor for moving the head in a radial direction of the disc, an extracting circuit for extracting a vertical blanking period portion of the reproduced FM video signal, a circuit for sampling and holding a D.C. level of the vertical blanking period portion and for obtaining a digital value indicative of the sampled and held D.C. level, a memory for storing the digital value, and a control circuit for controlling a write-in and a read-out with respect to the memory. The control circuit supplies a control signal to the moving mechanism to move the head to a plurality of positions which are mutually separated by predetermined minute quantities with respect to one track pitch and writes a plurality of digital values into the memory which plurality of digital values are obtained when the head assumes the plurality of positions. The control circuit obtains a maximum digital value from among the plurality of digital values stored in the memory and supplies to the moving mechanism a control signal for moving the head to a position where the maximum digital value is obtainable.

REFERENCES:
patent: 3649752 (1972-03-01), Hinjo
patent: 3761604 (1973-09-01), Ozawa et al.
patent: 4415939 (1983-11-01), Ballard
patent: 4485418 (1984-11-01), Bremmer
patent: 4499510 (1985-02-01), Harding et al.
patent: 4525750 (1985-06-01), Hamalainen

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